Abstract:
This research focuses on determining and validating the Material Removal
Rate (MRR) by actual machining of drilling operation. Drilling operation is still
widely used in the aerospace, aircraft and automotive industries although
modern metal cutting methods have been developed in the manufacturing
industries. MRR formula is used to calculate the weight of solid waste
generated during drilling operation. This weight can be used to estimate the
cost of disposal of the solid waste in a machining workshop. Hence the
validation of MRR formula for drilling operation is necessary to determine
how much the theoretical value away from the experimental value. In this
project, three types of materials are needed to determine the MRR value.
The three materials are mildsteel, aluminum and brass. The drilling operation
are performed physically to determine the amount of waste generated for a
specify depth of cut. High-speed steel was used as the cutting tool and the
material removal rate formula of drilling operation. Machine was used: Deckel
Maho DMU 50. Statistical analysis using SPSS to analysis the variance
between physical value and theoretical value. The variance of the three
workpiece of the same material is equal claimed as null hypothesis. The
result showed that there were no significant different to reject null hypothesis
as the P-value was more than 0.05 where the level of confidence is 95%. The
causes for the difference of weight between the physical observation and the
weight derived from the MRR formula were determined using an Ishikawa
diagram.
